Different Thyristor Gate width gives different waveforms.

Question

Yasith Randila 2023-12-2

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回答： Joel Van Sickel 2023-12-6

In the below fully controlled converter, if I give Thyristor pulse width as 10% gives an incorrect output waveform.

It gives following waveform for 10% Duty ratio. (2 cycles are shown)

But for 50% duty ratio it gives the correct desired waveform. (2 cycles are shown)

Can someone please explain me what is the reason for that?

Thank you in advance.

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Answer 1

Joel Van Sickel 2023-12-6

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Are you sure the results are wrong? You don't have a dc-link capacitor to maintain the dc voltage and with the inductive load and inductive transmission line, the thyristors can't turn off until current goes to zero regardless if the voltage goes negative.